Improvement in sectional steam-boilers



Q J. W. HARD. Sectional Steam-Boiler.

No. 201,412. Patented March 19, I878.

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JOHN WV. HARD, OF DEOORAH, IOWA.

IMPROVEMENT IN SECTIONAL STEAM-BOILERS.

Specification forming part of Letters Patent No. 201,412, dated March 19, 1878; application filed To all whom it may concern Be it known that I, JOHN W. HARD, of Decorah, in the county of Winneshiek and State of Iowa, have invented a new and valuable Improvement in Sectional Steam-Boilers; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon.

Figure l of the drawings is arepresentation of a central vertical section of the spring-rod, taken through the line 00 00 of Fig. 2. Fig. 2 is a plan view of a steam-boiler with my improved springrods applied. Fig. 3 is adetail view of one of the bosses.

The object of my invention is to improve the construction of sectional steam-boilers, and to make the sectional boilers free from liability of explosion.

This invention is designed as an improvement on the sectional steam-boiler shown in my Letters Patent dated May 23, 1876, No. 177,635; and the novelty consists in a spring bolt or rod made in two parts, connected together by a spring, the outer ends of which are attached to the upper and lower sections of the boiler.

In the accompanying drawings, A and D represent two sections of a steam-boiler, which may be of any size, shape, and construction, with a bevel or rabbet joint, Y. B represents the yielding spring bolt or rod, composed of two parts, B B, the outer ends being screwthreaded at O, and engaging with screwthreaded perforations in the bosses or plugs June 4, 1877.

K, and connected at their inner ends preferably by a spiral spring, M, encircling the parts, as shown in Fig. 1 of the drawings.

Near the inner ends of the parts B B are secured lugs or pins d, between which the spiral spring is confined.

Each boss K is provided with one or more shoulders, e, to serve as seats for the boilersections.

By the construction above described, it will be seen that any undue or sudden increase of steam or gases in the boiler will extend the yielding spring-bolt and open a vent for the escape of surplus steam, thereby preventing an explosion.

WVhat I claim as my invention is- 1. In a sectional steam-boiler, a yielding spring bolt or rod, constructed substantially as described.

2. A yielding spring bolt or rod for sectional steam-boilers, composed of two parts united together at their inner ends by means of a spring, and' having their outer ends screw-threaded, substantially as and for the purposes set forth.

3. The combination, with a sectional steamboiler, jointed at the intersections and provided with screw-threaded bosses, of the yielding sectional bolt, screw-threaded at its outer ends, and provided with a spring for connecting the sections together, substantially as described.

JOHN W. HARD.

Witnesses LOUIS MARTENS, EUNICE THURSTON. 

